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Accumulated other comprehensive income (Tables) | 9 Months Ended
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Sep. 30, 2025
Equity [Abstract] |
Schedule of accumulated other comprehensive income | A summary of the net changes in after-tax accumulated other comprehensive income attributable to Berkshire shareholders follows (in millions).
| Unrealized investment gains (losses) |  | Foreign currency translation |  | Long-duration insurance contracts |  | Defined benefit pension plans |  | Other |  | Total |
2025 |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the year | $ | 117 |  | $ | (7,039 | ) | $ | 2,015 |  | $ | 1,148 |  | $ | 175 |  | $ | (3,584 | )
Other comprehensive income |  | 99 |  |  | 1,207 |  |  | (120 | ) |  | (102 | ) |  | (23 | ) |  | 1,061 |
Balance at September 30, 2025 | $ | 216 |  | $ | (5,832 | ) | $ | 1,895 |  | $ | 1,046 |  | $ | 152 |  | $ | (2,523 | )
2024 |  |  |  |  |  |  |  |  |  |  |  |
Balance at the beginning of the year | $ | 190 |  | $ | (5,393 | ) | $ | 1,353 |  | $ | (97 | ) | $ | 184 |  | $ | (3,763 | )
Other comprehensive income |  | 81 |  |  | 78 |  |  | (10 | ) |  | (44 | ) |  | (34 | ) |  | 71 |
Balance at September 30, 2024 | $ | 271 |  | $ | (5,315 | ) | $ | 1,343 |  | $ | (141 | ) | $ | 150 |  | $ | (3,692 | )

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